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Multi-Way Conventional loudspeakers with crossovers

The best cabinet material !!!!
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Old 13th July 2017, 05:25 PM   #571
gdan is offline gdan  Greece
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Hi,

If it is white noise, I don't think that there is something to do.

If it was 50 Hz, I have found that a very effective solution is to wrap a very thin aluminum foil (like the one used in cooking) around the accelerometer and connect this to the ground.
Of course in your case, first you should use something (like a thin plastic membrane) to isolate the active parts from the aluminum.
The added weight is not much and you can measure without the disturbances from the 50 Hz line.

regards
George
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Old 14th July 2017, 01:55 AM   #572
FE3T is offline FE3T  Norway
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I dont know how aviable its in sheeting, but i once buildt a subwoofer tube for the car in 20mm thick polypropylene tubing. talk about dense, and dead stuff.
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Old 14th July 2017, 05:28 AM   #573
bwaslo is offline bwaslo  United States
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The best cabinet material !!!!
Quote:
Originally Posted by gentlevoice View Post
...
However, the accelerometer is excessively noisy - so much that even with a quite restrictive band-pass filter I reckon that it will only be marginally useful for (any) measurements that does not involve major excursions and fast accelerations. I've had this high noise level confirmed on ADI's webpages so, well, "moment of truth" this time was not too useful.

Just would like to mention it should one of you consider such an accelerometer.

Cheers,

Jesper
You might want to look into one of Measurement Specialties' AH-01 piezo accelerometers. Broadband, high output, has internal FET buffer (like an electret mic uses). Not too expensive.

1-1001220-0 Measurement Specialties | Mouser

ACH-01-04/10 Measurement Specialties | Mouser
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Old 14th July 2017, 08:33 AM   #574
gentlevoice is offline gentlevoice  Denmark
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The best cabinet material !!!!
Hi George & bwaslo - thanks for your replies & suggestions ...

@bwaslo: I've actually already looked at the ACH-01 but I will be measuring structures that are microphone/headphone sizes so I assessed that it - due to its weight - would influence the measurements. As it is I think I will go with a measurement microphone - I already have a couple of B&K 4133 capsules which should be usable for this.

@gdan:

Quote:
If it was 50 Hz, I have found that a very effective solution is to wrap a very thin aluminum foil (like the one used in cooking) around the accelerometer and connect this to the ground.
... I'll keep this in mind should I run into 50 Hz issues ;-)

Cheers,

Jesper
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Old 15th July 2017, 02:07 AM   #575
Dave Zan is offline Dave Zan  Australia
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Quote:
Originally Posted by gedlee View Post
It's Renshape...If the price doesn't bother you then there is no comparison...
There are many varieties of Renshape, which one do you recommend?

Best wishes
David
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Old 17th July 2017, 06:56 AM   #576
gentlevoice is offline gentlevoice  Denmark
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Quote:
There are many varieties of Renshape, which one do you recommend?

Best wishes
David
Hi ... This would be interesting to me as well as I'm about to inquire about samples from obo-werke. In my context the a moulding compound would also be most relevant - so if you have a suggestion here as well I'd appreciate this ...

And then about accelerometers etc.: Would it be (maybe an even better) solution to use e.g. a Panasonic WM-61A microphone capsule instead of an accelerometer? Noise levels probably would be much lower and the weight of the capsule is only 70 mg higher than the ADXL-001 which I reckon is already low weight (the WM-61A weighs 0.22 grams). And it may also be connected with low weight wires and should not be more difficult to mount on the DUT than an accelerometer ...

Any comments on this?

Cheers,

Jesper
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